# Polynomials and Rational Expressions Question

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[math]x^4 - y^4[/math]

- [math](x - y)^4[/math]
- [math](x^2 + y^2)(x + y)(x - y)[/math]
- [math](x^2 + y^2)(x^2 - y^2)[/math]
- Can't be factored